Re: //gs Memory 8 or 16megs?

[Matt Jenkins <mdj@bilby.cs.rmit.edu.au>]

frankc <frankc@srv.net> wrote:
> I am under the impression that it does support 8MB of RAM and 8MB of
> ROM.  Not sure how the computer actually seperates the memory or
> if this seperation is even enforced other than in the OS itself.  Can
> anyone fill answer that?  Are apps capable of accessing the full 16MB as
> RAM
> if it were installed or does the OS or BIOS enforce the seperation?  I am
> curious.

It's hardware enforced. A 16mb address space is 24 bit addressing, so Apple
simply made any access with bit 23 (24 if you like) set a ROM access.

I believe there was one memory card that sidestepped the problem and
allowed 12mb of RAM (since the ROM on the GS was only 1mb) but I don't
remember which one, nor even if it was fully compatable with all software.

Hope this helps..

Matt



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